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https://issues.apache.org/jira/browse/HDFS-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang resolved HDFS-1435.
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Resolution: Fixed
Release Note: This provides an option to store fsimage compressed. The
layout version is bumped to -25. The user could configure if s/he wants the
fsimage to be compressed or not and which codec to use. By default the fsimage
is not compressed.
Hadoop Flags: [Incompatible change, Reviewed]
I've committed this!
> Provide an option to store fsimage compressed
> ---------------------------------------------
>
> Key: HDFS-1435
> URL: https://issues.apache.org/jira/browse/HDFS-1435
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.22.0
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.22.0
>
> Attachments: checkpoint-limitandcompress.patch,
> trunkImageCompress.patch, trunkImageCompress1.patch,
> trunkImageCompress2.patch, trunkImageCompress3.patch,
> trunkImageCompress4.patch
>
>
> Our HDFS has fsimage as big as 20G bytes. It consumes a lot of network
> bandwidth when secondary NN uploads a new fsimage to primary NN.
> If we could store fsimage compressed, the problem could be greatly alleviated.
> I plan to provide a new configuration hdfs.image.compressed with a default
> value of false. If it is set to be true, fsimage is stored as compressed.
> The fsimage will have a new layout with a new field "compressed" in its
> header, indicating if the namespace is stored compressed or not.
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